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glo-grasberg-copper-gold-mine-indonesia

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SIKA AT WORK
GRASBERG COPPER-GOLD MINE,
WEST PAPUA, INDONESIA
CONCRETE: Sika® ViscoCrete®, Sika ViscoFlow®, Sigunit®,
SikaTard®, Sikacrete®, Sikafloor®
FRONTIER COPPER
PROJECT DESCRIPTION
The Grasberg mine operated by Freeport McMoRan and jointly
owned by Freeport and Rio Tinto is one of the largest mining
clusters on the globe. The mine is located in the very remote
highlands of the Sudirman mountain range in the province
of Papua, Indonesia. Re-discovered in 1960, production by
Freeport began in 1973 from the Ertsberg open pit. Rapid
expansion followed and the production from several different
ore bodies ramped up to 240’000 tons per day. The Grasberg
ore bodies contain very high combined copper-gold grades,
especially when considering the size of production. As ore extraction from the open pit will be soon uneconomic due to the
increased strip, production will continue to move underground
with block caved ore from the Grasberg Block Cave (GBC), and
Deep Ore Zone (DOZ) as well as ore from the Big Gossan ore
body that will be mined using open stoping methods. Freeport
plans to maintain the current mill throughput even after the
ore from the open pit has been depleted. The current output
should be achieved by the underground caving operations by
2021 when the support infrastructure will be installed.
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SIKA AT WORK
GRASBERG MINE INDONESIA
PROJECT REQUIREMENTS
The ore bodies within and around the Grasberg main intrusion
have been created due to the distinct structural and lithological contact of the intrusion with the surrounding limestone.
The extensive development for the existing and planned
underground operations will pass through areas of challenging geotechnical ground conditions especially at contact zones
from the igneous complexes to the sediments. Challenging
underground conditions demand high requirements for the
underground support. For the Grasberg block cave alone,
30’000 meters of development for ventilation and conveyor
declines are constructed, which represents a challenge from
both, a logistics and a planning point of view. Long transport
distances require long open time of the concrete when leaving
the batch plant to the point of use. Also material transportation to the remote mine site warrants detailed planning.
As the mine is located in an area with large amounts of annual
rainfall, the underground development faces areas which high
pressure and high volume water inflows. Furthermore, the risk
of elevated rock stresses and rock bursts is increasing when
reaching deeper levels of the underground infrastructure and
hence, good yielding properties of the shotcrete liner is necessary to take up the increased dynamic loads.
The mill infrastructure has been constantly expanded since
the 70ies and a whole range of refurbishment works are undertaken on a constant basis to maintain the productivity of
the ore milling and concentrator facilities.
SIKA SOLUTION
Freeport McMoRan and its main contractors such as Redpath
are long standing partners of Sika. Sika supplies large quantities of supplies to the Grasberg operation including concrete
admixtures for self- compacting shaft lining concrete and
shotcrete, shotcrete accelerators, two component injection
resins and refurbishment products. Especially for the rapid
underground development, high performing Sika Sigunit®
shotcrete accelerators are in use to reach high early strength
of the shotcrete that allow short cycle times. The extensive
development of the Main Grasberg block cave (GBC) is solely
supported by Sika admixtures. Sika trains shotcrete applicators at the mine site and fulfills highest environmental,
health and safety standards for the materials supplied.
SIKA PRODUCTS
́́ Sika® ViscoCrete®
́́ Sika ViscoFlow®
́́ Sigunit®
́́ SikaTard®
́́ Sikacrete®
́́ Sikafloor®
Grasberg Open Pit
2.5 km
1 km
Kucing Liar
Grasberg Block Cave
DOZ
Big Gossan
ESZ
MLZ
Deep MLZ
p Portal
To Ridge Cam
Underground infrastructure for the major ore bodies of the Grasberg
Mining Complex. In red the Grasberg block cave (GBC) source: Freeport
McMoran
SIKA AT WORK
GRASBERG MINE INDONESIA
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Our most current General Sales Conditions shall apply. Please consult
the most current local Product Data Sheet prior to any use.
SIKA SERVICES AG
Tueffenwies 16
CH-8048 Zurich
Switzerland
Contact
Phone +41 58 436 40 40
Fax
+41 58 436 41 50
www.sika.com
© SIKA SERVICES AG / CONCRETE / CMDL / GRASBERG COPPER-GOLD MINE, INDONESIA / 10.2015 / ID: 60880
GRASBERG MINE, INDONESIA
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